Jack mechanism for full-fashioned knitting-machines



' M. ZWICKY.

JACK MECHANISM FOR FULL FASHIONED KNITTING MACHINES.

' APPLICATION FILED MAR. 11. 1920.

1,371,535. Patented. Mar. 15,1921

nnirno STATES PATENT OFFICE.-

MELCHIOR ZWIGKY, 0F WYOMIS SING, PENNSYLVANI A, ASSIGN'OR TO TEXTILEMACHINE WORKS, OF WYOMISSING, PENNSYLVANIA, A. CORPORATION" OFPENNSYLVANIA.

JACK MECHANISM FOR FULL-FASHIONED KNITTINQ MACHINE$ Specification ofLetters Patent.

Patented Mar. 15, 1921.

Application filed March 17, 1920. Serial No. 366,679.

To allwltom itmay'concewt:

Be it known that I, MnLoHion Z 'ICKY, a citizen of the United States,residing at \Vyomissing, in the county" of Berks and State ofPennsylvania, have invented oer-- tain new and useful Improvements inJack.

chine, showing the mounted sinkers and the operating slur-camtherefor,-in connection with my improved jack mechanism.

Fig. 2 is a partial rear-face view of the jack mechanism, with partsbroken away;

and Fig. 3 is a partial planview of the same.

The movably mounted s nkers 10, 111 the sinker head 11, are projectedagainst the verge plate 12, as usual, by action of the sliding slur-camon slur-cam bar i l; this being. effected throu h corresponding seriesof interposed jacks i5. which are swung on axle 16 to press their upperends 17 against the sinkers. The object of my improved construction isto provide for satisfactorily insuring definite accurate movement of thesinkers, which is absolutely required for uniform knitting, and at thesame time avoiding objectionable wear of'the parts in effecting suchmovement. 3

The jack axle 16 is fixed in end pieces 20 of the jack bed 21. and thesheet-material jacks 15 mounted thereon are swung between acorresponding series of spacing I plates 22, which are held to the bed2l by a clamping bar 23, with the forward and rear edges thereof engagedrespectively in slots of a forward bar 25 and of a rear bar 26 extendingbetween the end pieces 20. An intermediate rear bar 27 safely retainsthe conveniently placed jacks upon the axle 16, leaving space above itfor passage of the slur-cam 13 into operating contact with the rearedges 28 of the jacks. Positive stopping of the forward movements of thej acks is vprovided for, with extended stopping contact, by adapting andlocating said forward bar 25 to cause the front edges 29 of the jacks toabut squarely against the ribbed inner face thereof when thesinker-contacting heads of the jacks have been properly projected, asshown in Fig. 1; said inner face being accurately finished and setparallel to the verge plate, so that the sinkers will be uniformlypositioned when the jacks are thus pressed against'it, and a longedgecontact of the latter will be provided for wea lVit-h positive andaccurate stopping of the ack movements thus insured,- required adustment of the slur-cam to effect such movement is simplified, and it ispossible to so mount the same as to provide for such a yielding of thecam upon contact of the jacks with the stop-bar 25, as will in any Caseprevent undue strains and wear.

The required accurate setting relatively of this stop-bar and the vergeplate is readily secured and maintained, and the latter prevents anyotherwise possible throwing of the sinkers beyond the limit of positivemovementset by the stop bar, so that any hurtful variation from absoluteuniformity of the projected sinker positions cannot occur.

hat I claim is:

In a straight knitting machine, the combination with a suitably mountedseries of sinkers and an operating slur cam therefor. of an interposedcorresponding series of piv'otally carried sinker-contacting jacks, afixed forward stop-bar against which said jacks are swung by the passingslur-cam to determinedly project the sinkers, afixed rear retaining barfor said jacks, and fixed spac ing plates for the jacks extendingbetween.

MELOHIOR ZWIOKY.

